/Engine/Source/Editor/StaticMeshEditor/Public/StaticMeshEditorSubsystem.h
Set the LODGroup for the specified static mesh
Success
bool SetLODGroup ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, [FName](API\Runtime\Core\UObject\FName) LODGroup, bool bRebuildImmediately )